Phys.org news tagged with:antiparticleshttp://phys.org/
en-usPhys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.Physicists offer a solution to the puzzle of the origin of matter in the universeMost of the laws of nature treat particles and antiparticles equally, but stars and planets are made of particles, or matter, and not antiparticles, or antimatter. That asymmetry, which favors matter to a very small degree, has puzzled scientists for many years.http://phys.org/news/2015-02-physicists-solution-puzzle-universe.html
General Physics Wed, 25 Feb 2015 08:42:58 ESTnews344076168News about ghost particles(Phys.org) —Neutrinos are the most elusive particles having extremely weak interactions with all other particles. They have rather unusual properties and are even expected to be identical with their own antiparticles. So far this property is, however, not experimentally verified even though many studies of neutrinos over the last 60 years have already boosted our understanding of elementary particle physics.http://phys.org/news/2013-07-news-ghost-particles.html
General Physics Wed, 17 Jul 2013 13:52:36 ESTnews293287899Linear collider gains key insights from Cornell physicistsThe International Linear Collider (ILC), a global effort to build a particle accelerator that may unlock some of the universe's deepest mysteries, has received pivotal insights from Cornell physicists: They have designed a key component of the proposed collider, called a damping ring, without which the ILC's powerful particle collisions wouldn't be possible.http://phys.org/news/2013-07-linear-collider-gains-key-insights.html
General Physics Thu, 04 Jul 2013 07:39:36 ESTnews292142365LHCb experiment observes new matter-antimatter difference(Phys.org) —The LHCb collaboration at CERN today submitted a paper to Physical Review Letters on the first observation of matter-antimatter asymmetry in the decays of the particle known as the B0s. It is only the fourth sub-atomic particle known to exhibit such behavior.http://phys.org/news/2013-04-lhcb-matter-antimatter-difference.html
General Physics Wed, 24 Apr 2013 10:20:53 ESTnews286017633Precision measurements using top quarks at CMSAmongst all known elementary particles, the top quark is peculiar: weighing as much as a Tungsten atom, it completes the so-called 3rd generation of quarks and is the only quark whose properties can be directly measured. Owing to its mass, the top quark is unstable and, in CMS, decays much before it can interact with the proton remnants through the strong interaction and form hadrons (the bound states of quarks). It decays mostly to a W boson and a bottom (b) quark, and can therefore be identified from final states which involve the complete usage of the CMS detector; electrons, muons, jets, missing transverse energy—almost all particles or experimental signatures one can think of may be produced in top-quark events.http://phys.org/news/2012-11-precision-quarks-cms.html
General Physics Mon, 05 Nov 2012 07:41:34 ESTnews271323678Intermolecular space evaluation using slow positrons extracted into the atmosphereJapanese researchers have developed a controlled-environment positron probe micro-analyzer. This system can be used with the positron annihilation lifetime technique to evaluate open spaces such as atomic- and molecular-level defects, holes, and pores in functional thin films in an ambient gas at atmospheric pressure that is controlled as an actual environment.http://phys.org/news/2012-09-intermolecular-space-positrons-atmosphere.html
General Physics Wed, 26 Sep 2012 09:19:51 ESTnews267869980MAJORANA, the search for the most elusive neutrino of all(Phys.org) -- In a cavern almost a mile underground in the Black Hills, an experiment called the MAJORANA DEMONSTRATOR, 40 kilograms of pure germanium crystals enclosed in deep-freeze cryostat modules, will soon set out to answer one of the most persistent and momentous questions in physics: are neutrinos their own antiparticles? If the answer is yes, it will require rewriting the Standard Model of Particles and Interactions, our basic understanding of the physical world.http://phys.org/news/2012-05-majorana-elusive-neutrino.html
General Physics Thu, 17 May 2012 07:50:01 ESTnews256457300Researchers find possible evidence of Majorana fermions(Phys.org) -- Researchers working out of Delft University of Technology in the Netherlands have constructed a device that appears to offer some evidence of the existence of Majorana fermions; the elusive particles that are thought to be their own antiparticles. The team, as they describe in their paper published in Science, created a device with a topological superconductor that was also able to measure the relationship between current and voltage at significant points on a nanowire which when in the presence of a magnetic field or electrical current, indicated the existence of Majorana fermions.http://phys.org/news/2012-04-evidence-majorana-fermions.html
General Physics Fri, 13 Apr 2012 07:12:18 ESTnews253519905Repulsive gravity as an alternative to dark energy (Part 2: In the quantum vacuum)(PhysOrg.com) -- During the past few years, CERN physicist Dragan Hajdukovic has been investigating what he thinks may be a widely overlooked part of the cosmos: the quantum vacuum. He suggests that the quantum vacuum has a gravitational charge stemming from the gravitational repulsion of virtual particles and antiparticles. Previously, he has theoretically shown that this repulsive gravity can explain several observations, including effects usually attributed to dark matter. Additionally, this additional gravity suggests that we live in a cyclic Universe (with no Big Bang) and may provide insight into the nature of black holes and an estimate of the neutrino mass. In his most recent paper, published in Astrophysics and Space Science, he shows that the quantum vacuum could explain one more observation: the Universe&#146;s accelerating expansion, without the need for dark energy.http://phys.org/news/2012-01-repulsive-gravity-alternative-dark-energy_1.html
General Physics Wed, 01 Feb 2012 10:00:01 ESTnews247253633Four reasons why the quantum vacuum may explain dark matter(PhysOrg.com) -- Earlier this year, PhysOrg reported on a new idea that suggested that gravitational charges in the quantum vacuum could provide an alternative to dark matter. The idea rests on the hypothesis that particles and antiparticles have gravitational charges of opposite sign. As a consequence, virtual particle-antiparticle pairs in the quantum vacuum form gravitational dipoles (having both a positive and negative gravitational charge) that can interact with baryonic matter to produce phenomena usually attributed to dark matter. Although CERN physicist Dragan Slavkov Hajdukovic, who proposed the idea, mathematically demonstrated that these gravitational dipoles could explain the observed rotational curves of galaxies without dark matter in his initial study, he noted that much more work needed to be done.http://phys.org/news/2011-11-quantum-vacuum-dark.html
General Physics Mon, 28 Nov 2011 13:58:10 ESTnews241707260Charming surprise: First evidence for CP violation in charm decaysThe LHCb Collaboration has presented today at the Hadron Collider Particle Symposium in Paris possible first evidence for CP violation, the difference between behaviour of matter (particles) and antimatter (antiparticles), in charm decays.http://phys.org/news/2011-11-charming-evidence-cp-violation-charm.html
General Physics Tue, 15 Nov 2011 17:12:30 ESTnews240599530New SuperB factory particle-accelerator project launched in Italy(PhysOrg.com) -- The SuperB factory, a particle-accelerator to be built in Rome and approved last May by the Italian government was officially launched this past Friday with construction set to begin sometime in the near future. The accelerator, which is expected to take six years to build, will be constructed on the University of Rome Tor Vergata campus and will be named for the late Nicola Cabibbo, the Italian physicist best known for his work with weak force interactions.http://phys.org/news/2011-10-superb-factory-particle-accelerator-italy.html
General Physics Wed, 12 Oct 2011 11:03:22 ESTnews237636186Beam line 13 fuels discovery fever for fundamental physicists(PhysOrg.com) -- The simplest, most sensible "Big Bang" universe, theoretical physicists believe, would be one in which equal numbers of particles and antiparticles are formed in pairs. As the universe cools, most of these particles would encounter their antiparticles, and they would annihilate.http://phys.org/news/2011-06-line-fuels-discovery-fever-fundamental.html
General Physics Fri, 24 Jun 2011 08:24:36 ESTnews228122651Neutrino detector starts measurement(PhysOrg.com) -- The Double Chooz collaboration recently completed its neutrino detector which will see anti-neutrinos coming from the Chooz nuclear power plant in the French Ardennes. The experiment is now ready to start collecting data in order to measure fundamental neutrino properties with important consequences for particle and astro-particle physics.http://phys.org/news/2011-01-neutrino-detector.html
General Physics Wed, 26 Jan 2011 16:47:57 ESTnews215282820First observation of particles that are their own antiparticles could be on its wayThe matter that makes up the universe consists of particles such as electrons and protons, as well as their counterparts known as antiparticles. Particles and antiparticles that collide, however, annihilate each other in an intense flash of energy. Nevertheless, the Italian physicist Ettore Majorana proposed that some particles could exist that are their own antiparticles although physicists are yet to observe such particles.http://phys.org/news/2011-01-particles-antiparticles.html
General Physics Fri, 14 Jan 2011 10:22:53 ESTnews214222938 Could dark baryons explain dark matter?(PhysOrg.com) -- "The prevailing belief about dark matter particles is that they should be about 100 or more times heavier than protons," Subir Sarkar tells PhysOrg.com. "However, we were thinking about the possibility of lighter particles that can constitute dark matter, which may be more easily detectable with current experiments."http://phys.org/news/2010-07-dark-baryons.html
General Physics Tue, 20 Jul 2010 08:47:27 ESTnews198834411Has PAMELA Already Seen Dark Matter?(PhysOrg.com) -- Back in 2006, PAMELA (a Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) was launched with the purpose of detecting cosmic radiation and looking for clues pointing to dark matter. And now it's possible that PAMELA might have already spotted dark matter. http://phys.org/news/2009-08-pamela-dark.html
General Physics Tue, 25 Aug 2009 16:24:43 ESTnews170436249